Ground the chassis – Rockwell Automation 1771-A1B_A2B_A3B_A3B1_A4B SERIES B Universal I/O Chassis Installation Instructions User Manual
Page 10
Universal I/O Chassis
10
Publication 1771ĆIN075A-EN-P - March 2002
Ground the Chassis
This I/O chassis
Has grounding stud(s) located
1771ĆA1B
1771ĆA2B
1771ĆA3B1
1771ĆA4B
1771ĆA3B
1
To prevent ground loops from
occurring, use only one grounding stud when
grounding your equipment.
!
ATTENTION
Use the following information, along with the installation manual for
your programmable controller to ground the I/O chassis and your I/O
modules.
Chassis Ground
SingleĆpoint Grounding
I/O chassis side plate
star washer
nut with captive washer
ground lug
1
ground lug
nut with captive washer
When you connect grounding conductors to the I/O chassis
grounding stud, place a star washer under the first lug, then
place a nut with captive lock washer on top of each ground lug.
Torque the nut with captive washer to 18(+3) pound-inches.
grounding stud
1
Use the cup washer if crimpĆon lugs are not used.
#10 threadĆforming screw
externalĆtooth washers
19923
Use singleĆpoint grounding for extendedĆlocal I/O system
The systems must be grounded properly for proper
performance.
!
ATTENTION
!